滴灌条件下成龄核桃树叶水势变化规律研究

A Study of Leaf Water Potential Change Rule of Matured Walnut under Drip Irrigation Conditions

通过田间试验,研究了滴灌成龄核桃叶水势变化规律及其与气象因子间的关系,结果表明:滴灌成龄核桃叶水势日变化呈单峰曲线变化,在14:00-16:00达到一天中的最低值;试验条件下不同生育期核桃露点叶水势与土壤含水量的关系不尽相同,在果实膨大期、硬核期和油脂转化后期呈正相关关系,油脂转化前期呈负相关关系,通过回归分析建立了不同生育期二者的函数关系;滴灌成龄核桃叶水势日变化与太阳辐射和大气温度负相关,与相对湿度正相关,通径分析表明,影响核桃叶水势日变化的主要气象因子是大气温度,其次是大气相对湿度、太阳辐射;建立了滴灌成龄核桃叶水势日变化与气象因子之间的函数关系。

A field experiment is carried to study the relationship between the leaf water potential of ripe walnut（LWPOMW） and the meteorological factor under the condition of drip irrigation.Results show that LWPOMW diurnal change in the form of a single-peaked curve comes to the minimum value at 14：00-16：00 PM.under the condition of an experiment,the relationship of dew point LWPOMW and soil moisture content is different in different growth periods.There＇s a positive correlation between them in the fruit swollen period,the hardcore period and the anaphase of fat conversion period,but a negative correlation in the prophase of fat conversion period.After a regression analysis established a regression equation of them in different growth periods,there＇s a negative correlation between LWPOMW and atmospheric temperature and solar radiation,a positive correlation between LWPOMW and atmospheric relative humidity.A path analysis of them shows that solar radiation is a key factor that affects LWPOMW diurnal change,another more important factor is atmospheric relative humidity and atmospheric temperature.A regression equation between LWPOMW and meteorological factor is also established under the condition of experiments.